Attachment for locks



(No Model.)

L. L. BBTTYS. ATTACHMENT FOR LOCKS,

N0. 528,269. Patented oct. so. 1394.v

UNITED vSTATES PATENT OFFICE LAFAYETTE L. BETTYS, OF OAKLAND,CALIFORNIA.

ATTACHMENT FOR LOCKS.

SPECIFICATION forming part of Letters Patent N 0. 528,269, dated October30, 1894. Application filed .Tune 20, 1894. Serial No. 515,083. (Nomodel.)

rTo all whom t may concern:

Be it known that I, LAFAYETTE L. BETTYs, a citizen of the United States,residing at Oakland, in the county of Alameda and State of California,have invented certain new and useful Improvements in Attachments forLocks; and I do hereby declare that the following is a full, clear, andexact description thereof.

My invention relates to means for preventing at will any ordinary lockfrom being operated from the outside.

It frequently happens that houses are feloniously entered by the simpleinsertion of a duplicate or a skeleton key into the keyhole, or else,the door having been locked on the inside and the key left in place, byusing forceps to turn this key, and thus unlocking the door with littledifficulty.

My invention provides a simple means for rendering it impossible to movethe bolt, whether the key is left in place or taken out, and which canbe manufactured and sold as a separate implement, capable of easyattachment to any ordinary lock.

In the following description of my invention reference will be made tothe accompanying drawings, in Which-.-

Figure 1 is a front elevation of a part of a doorshowing the lock-caseand bolt in dotted lines, with my attachment applied to the same. Fig. 2is an end view, partly in section, of the same, showing the door lockedand the bolt secured. by my device. Fig. 3 is a top view showing thedoor locked, with my device attached but withdrawn from the bolt. Fig..tis an elevation of the attachment itself. Fig. 5 is a view of the sameat right angles. Fig. 6 is an end elevation of my device.

A is a portion of a door, showing in dotted lines an ordinary lock Bmortised therein, and having a bolt C, which is operated by means of akey inserted in the keyhole D. This lock forms no part of my invention,and is illustrated only to show the method of applying my device, whichis shown thus applied in Figs. l, 2, and 3, and separately in Figs. 4,5, and 6.

E is a plate or escutcheon, which is attached to the door in the samehorizontal plane as the bolt C. The escutcheon E is provided with ahollow boss or thimble l, which, when the device is in place, iscountersunk into the vtact with the two inclined planes'.

door. This boss is bored to a size sutticient to accommodate the slidingpin 2 which moves freelytherein. The doorahving been locked, a hole isbored through the lock-plate B and bolt C in line with the pin 2. Thissimple arrangement would render the lock inoperative when the pin ispushed in, as the pin wouldppenetrate both lock-plate and bolt, andprevent the latter from sliding; but it would be open to someobjections. The pin could be pulled entirely out of the escutcheon andmislaid, or, having been pushed in, it might be displaced by violentlyshaking the door. I obviate these objections by the following means: Atransverse pin 3 is secured through the pin 2, and the boss lis slottedat 4 so that the pin 3 is guided in the slots when the pin 2 is moved ineither direction in the boss. This piu 3 prevents the pin 2 from beingdrawn entirely out of the escutcheon, and also forms part of thearrangement for holding the pin 2 tightly in'place when pushed in. Forthis purpose the two sides of the inner end of the boss l, separated bythe slot 4, are beveled or inclined at 5, 6, in the direction ofopposite portions of a screw thread. Consequently, when the pin 2 ispushed in to its fullest extent, and then turned, the pin 3 will bear orwedge upon the inclined planes 5, 6, and will be held securely. Figs. 2,4, 5, and 6 show the device in this position. To withdraw the pin it isonly necessary to turn it in the opposite direction as far as it willgo, which brings the transverse pin 3 into line with the slot, it beingprevented from turning too far by striking the projecting ends of theopposite planes. The pin 2 has, for convenience, a knob 7 at its outerend. After the pin has been pushed in and turned as described, it willbe seen that no key, whether applied from the inside or the outside, canunlock the door,and no shaking can dislodge the pin, on account of itsrm frictional con- After the pin has been withdrawn and the doorunlocked, the pin cannot inadvertently be pushed in, as it is immovable,except when the hole in the bolt O is in line with it.

What I claim is- An attachment for the locks of doors and the like,consisting of an escutcheon having a hollow boss slotted longitudinally,oppositely inclined ends to said boss, and a look- In testimony whereo`I affix my signature, ing pin having a fixed transverse guide pin, inpresence of two Witnesses, this 11th day of the said guide pin beingadapted to travel in June, 1894.

said slot, to be wedged upon the inolines of LAFAYETTE L. BETTYS. saidboss, and to prevent the withdrawal of Witnesses:

the sliding pin, through the esoutoheon, sub- L. W. SEELY,

stantielly as set forth. JOHN COFFEE.

